As backpackers need waterproof protection for their belongings but dont necessarily need the bulk or maximum durability of a traditional submersible dry bag, the Sea to Summit Lightweight Dry Sack is an ideal alternative.The dry sacks 70D nylon fabric is highly durable and is coated for high water-resistance. Fully-taped seams further ensure weather protection and reinforced stitching bolsters strength. A Hypalon roll-top closure provides wide-open access to the sacks interior but battens down the hatches by using an internal stiffener to create a secure seal. Delrin buckles emit a positive click when connected to confirm that youve properly protected contents. Oval shaping at the bottom of the dry sack provides structure and makes packing easy.